Final answer:
Tightening policy contracts the monetary base and loosening policy expands the monetary base.
Step-by-step explanation:
A tightening monetary policy, also known as a contractionary monetary policy, contracts the monetary base. On the other hand, a loosening monetary policy, also known as an expansionary monetary policy, expands the monetary base. Therefore, the correct statements are: 1) Tightening policy contracts the monetary base and 2) Loosening policy expands the monetary base.